[Ltrace-devel] DWARF prototypes: handling symbol aliases

[Petr Machata]

Dima Kogan <lists at dima.secretsauce.net> writes:

>  ./ltrace -L -x xyz /tmp/pie-yjtNlTxFte
>
> Running that same command with that same executable later worked just
> fine. There was some log file that was being generated that had 200MB of
> the same error repeated on every line. Something about an illegal or
> duplicated breakpoint; don't exactly remember, sorry. Re-running the
> test suite didn't show this problem.
>
> By the way, how much of the suite is supposed to pass normally? I always
> see some failures and a segfault. The configuration is Debian/sid on
> amd64; nothing noteworthy.

Well, most of it.  Different parts on different architectures.  I was
never very careful to formally state in each test case which arches have
that support an which don't, so typically what happens is that I
implement a new arch-dependent feature (say, tracing irelative symbols),
and the corresponding test only passes on x86_64, with the rest
following possibly later.

Right now, on my x86_64 installation, I see a SIGSEGV in main-vfork.exp,
which I think is fairly new (didn't use to be there, say, half a year
ago, I reckon); struct_func_str9 and struct_func_str16 fail in
parameters-str.exp--I think those are your new test cases; and wcstold
in wchar.exp fails, but that has been there for some time, I just
haven't had time to look into it yet.

> I just pushed a patch. You were using an older gcc than me, and it's
> more picky. Before this patch I successfully tested with gcc 4.9. After,
> gcc 4.6 works too.

Yep, works now.

> I also just discovered that this new symbol aliasing code works with
> 'ltrace -l', but not any of the other filtering options. I'll take a
> look when i have time; hopefully by next week.

OK.  Let me know when you are happy with the code.

Thanks,
PM